Scarifier



4 1,623,317 April 5. 1927f R. G. LE ToURNEAu SCARIFIER Filed June 2.1925 "fill/l1.

INVENIQR R.GLe-Tourneau I BY ATTO EY ent manners.

mitted, and at times the bolt or tooth'breaks. In anyevent considerabletime and effort is Patented Apr. 5, '1927.

j 1 UNITED ns'rATlazs 1,623,317 PATENT oFFlc'ni ROBERT G. I .ET'OUBNEAU, Voii srocxrou, CALIFORNIA.

scAnIrIEn.

Application led June 2, 1926. Serial No.\118,164.

This invention relates to improvementsin scarifiers such as are used inconnection with road making `or repairing operations, and particularlyto the mounting and securing y of the teeth onto the scarier frame.

Such teeth due to the hard wear .to which they are subjected frequentlyrequire replacing either because of their being worn out or from havingbeen broken. Atp'resent as far as Iam aware all such teeth are mountedon their frame by bolting in differ- The bolt-nuts sometimes freeze s othat itfis almost impossible to get the same'ofhand yet if they are nottightly cinchedup the slippage of the teeth is pernecessary toI effecttoothchanges, as is well known' to all those operating devices of 'thischaracter. l Thei principal vobject of my invention therefore is toprovide .means for mounting such teeth to their frame in such a mannerthat they are positively held against upward anddownward movement, whileat the same time the teeth may be almost instantly removed whenevernecessary. yThe bolts with their objectionable features are elimv'inated, and the teeth are not weakened -in any manner so that there isno tendency for the same to fracture under any load. Alsov the holdingmeans is so arranged -that the strain on the teeth does not tend todistort orf break such means.

A further object of the invention is to producea simple and inexpensivedevice and yet one which will be exceedingly effective for the purposefor which it is designed.

These objects I accomplish by means 'of such structure andrelative`arrangement of kparts as will fullyappear by a perusal of the'-following specification and' claims.

.In the drawings similar characters of reference' indicate correspondingparts in the several views: l

set-up of the implement as a Whole forming no part of m invention.Thejbeam preferably comprises low box section member consisting of topand bottom platesl and 2, and end plates 3; all said plates being weldedtogether'. along their edges to forma rigid structure.

Each tooth to be mounted in connection with this beam comprises a groundengaging portion 4 of` suitablev shapeand a shank 5. The back face' ofths shank toward this upper end is beveled as at 6 with a head or lug 7latthe top overhanging the forward face of the shank. This taperedportion is. adapted to seat in vertically alined orifices 8 and 9 cutthrough -the plates 1 and`2 respectively, the upper orifice beingnarrower than the lower to correspond somewhat to the reduced size ofthe upper end of the shank.

The lower orifice 9is of such a size asto asv snugly receive the shankjust belowv the taper portion thereof, in which position of the shankthe head 7 rests on top of the beam.' It will therefore be seen that thetooth can' neither move u nor downto any extent. In order to ena le thehead to be cleared from the beam so that' it can pass through the upperorifice 8 when it is desired to remove the tooth, said'upper orifice isI nade sufficiently deeper or longer than the. adjacent portion of theshank so thatthe latter -may be tilted longitudinally suiiilcient forthe lhead to pass'through the orifice as shown by the dottedlineposition in the drawing. Tov normally prevent Jthe sha-ft y:fromhaving such tiltingl movement' I provide a drift keylO toy be removablyinserted into the' orifice 8 between the' rear edge of the same and theyadjacent face of the shank. With this arrangement itwill be seen thatthe workin strain on the tooth is taken by the forwar edge of the upperorifice and by the rear-edgeif the lower orifice. There is therefore notendency for the key to bes...

forced out of place or tol be distorted by ressure, but it will tendrather to lodge 1n place all the more firmly.

The length of the beam is suiiicient 'to enable any desired numbervofteeth to be mounted thereon,l while the` widthv of the l:beam 'is suchas to allow two rows of'teeth being supported. While the holes for suchrows are shown in the drawing as being in common longitudinallyalinementrelative to thevline of travel of the implement, theseV holes wouldactually be staggered or offset, since it will be obvious` thatV onetooth directly behind another would not be of any value.' i 'g It willalso be obvious that as far as the principle of construction andoperation of my arrangement isv concernedy the beamr l`could be madesolid, but such construction would'render the same so heavy as to beim'practicablegf' a hekey is straight, and is held in place by(giravity, so that it may be removed by han without the use ofany tools.A .short length of chain 11 preferably connects the key to the mainframe to prevent possible loss of the key. 4 In the type of device shownin Fig. 2, the taper portion 6a of the shankf extends below the orificeY9a, and the shank therefore lwedges into the orifice. Otherwise thearrangement of parts is`the same. 'l

From the foregoin description it will be readily seen that I aveproduced such a device as substantiall fulfills. the objects of theinventionas set orth herein.

While this specification sets forth in detailr the present and preferredconstruc- 1 tion of the device still in practice sueh 'may passtherethrou the'shank andl opening for4 normally preat the top thereofthan-at the ttom, a

tooth having a shank insertible through the opening from thebottomther'eof, the shank snugly fitting the opening at the bottom, butbeing lnarrower at its` upper end than the adjacent end of the opening,an overhanging head on the shank disposed to over.- hang the beam at oneend of the relatively wider portion of the opening, whereby when theshank is tilted in the o ening the-head gh, an means between ventingsuch tilting4 movement.

2; A structure as in claim l, said means comprising a removable drift tobe inserted lin the upper endl of the opening betweenv the face of theshank oppositeto the head and the adjacent end ofrthe`opening. 3. In ascarifier, a horizontal beam having a vertical opening therethrough, atooth having a shank insertible throu h the Qpenf' ing from the bottomthereof, t e rear face of the shank being tapered in a manner to causethe shank to Wedgingly engage the lower end of the opening but to,leavea space between the rear end of the opening at its top and the adjacenttapered face of the shank, ahead o n the shank verhanging the forwardface of the same to overhang the top' of the beam, and a removable draftinsertiblein the space at the upper end of n a vthe openi-ng. a Intestimony whereofI affix my signature.

- ROBERT G. LE froUnNEAU.

